IC マイレクス（Millex）フィルターユニット

UHPLC/UPLC® is a revolutionary chromatography technique that is gaining wide acceptance among researchers due to improved resolution, shorter chromatographic runs, and the capability for doing fast method development. The presence of sub-2 µm particles in UHPLC columns provide these benefits but also poses challenges in sample and mobile phase preparation. Particulate impurities in the sample or mobile phase can cause backpressure buildup in the UHPLC system, causing system failure. In fact, most UHPLC instrument vendors recommend filtration of mobile phase using 0.2 µm filters, but there is a lack of data showing the benefits of filtration. In this article we describe the filtration of mobile phases through syringe filters of varying pore size and membrane type, followed by analysis by UHPLC and mass spectrometry. Our results clearly indicate that filtration of mobile phase components using the optimal membrane filter will help protect UHPLC systems from particulate impurities that may clog and shut down the system, increase the sensitivity of detection, and improve the accuracy of quantitation.